KD, Executive Arm Chair Swivel Adjustable Height: 5.100mm Lant Gas lift With 350mm (Radius) Back Tilt Mechanism: Multi-functional mechanism could lock the back tilt position, provides a knob for the tension adjustment (Seat Angle 1-14 Degree) Padded Back & Seat: Brown PU 5-Star Base w/Casters: Powder Coating Base With Nylon Caster Armrest: Brown Padded & Powder Coating